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Remove exclusive backup mode

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Exclusive-mode backups have been deprecated since 9.6 (when
non-exclusive backups were introduced) due to the issues
they can cause should the system crash while one is running and
generally because non-exclusive provides a much better interface.
Further, exclusive backup mode wasn't really being tested (nor was most
of the related code- like being able to log in just to stop an exclusive
backup and the bits of the state machine related to that) and having to
possibly deal with an exclusive backup and the backup_label file
existing during pg_basebackup, pg_rewind, etc, added other complexities
that we are better off without.

This patch removes the exclusive backup mode, the various special cases
for dealing with it, and greatly simplifies the online backup code and
documentation.

Authors: David Steele, Nathan Bossart
Reviewed-by: Chapman Flack
Discussion: https://postgr.es/m/ac7339ca-3718-3c93-929f-99e725d1172c@pgmasters.net
https://postgr.es/m/CAHg+QDfiM+WU61tF6=nPZocMZvHDzCK47Kneyb0ZRULYzV5sKQ@mail.gmail.com
This commit is contained in:
Stephen Frost
2022-04-06 14:41:03 -04:00
parent 14d3f24fa8
commit 39969e2a1e
24 changed files with 246 additions and 1199 deletions
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7
src/include/access/xlog.h
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@ -276,14 +276,13 @@ extern void XLogShutdownWalRcv(void);
typedef enum SessionBackupState
{
SESSION_BACKUP_NONE,
SESSION_BACKUP_EXCLUSIVE,
SESSION_BACKUP_NON_EXCLUSIVE
SESSION_BACKUP_RUNNING,
} SessionBackupState;
extern XLogRecPtr do_pg_start_backup(const char *backupidstr, bool fast,
extern XLogRecPtr do_pg_backup_start(const char *backupidstr, bool fast,
TimeLineID *starttli_p, StringInfo labelfile,
List **tablespaces, StringInfo tblspcmapfile);
extern XLogRecPtr do_pg_stop_backup(char *labelfile, bool waitforarchive,
extern XLogRecPtr do_pg_backup_stop(char *labelfile, bool waitforarchive,
TimeLineID *stoptli_p);
extern void do_pg_abort_backup(int code, Datum arg);
extern void register_persistent_abort_backup_handler(void);